Someone told me that you go to the space center(in the city were you battle the twins gym leaders)every week.There will be a lauch every week.Is this true?If it is please tell me what pokemon you catch in space.

first you have to wait at least fifty weeks or you messed up the whole trickafter you are sure it has been 50 weeks go there and talk to the man looking out the windoehe says the rocket blasted off(0-49=nothing)(50-99=deoxyis)(100=jirachi)if you already talked the number will never changesorry